Chapter 3 - Troubleshooting
44
Fiber Optic Port Link LED is Off
When a fiber optic port on the switch is connected to a properly operating
end node, the Link LED for the port should be on. If a Link LED is off, do
the following:
Verify that the ecoSwitch setting on the front panel is not set to the
power saving mode by pressing the ecoSwitch push- button on the
front panel.
Verify that the end node connected to the port is powered ON and is
operating properly.
Check that the fiber optic cable is securely connected to the port on
the switch and the port on the end node.
Check to be sure that the SFP transceiver is firmly inserted into the
slot on the switch.
Make sure that you are using the appropriate type of fiber optic cable
and that the cable length does not exceed the allowed maximum
distance. For cable specifications for an SFP module, refer to the
installation instructions that ship with the module.
Use a fiber optic tester to test the attenuation on the cable and the
strength of the optical signal. For the operating specifications of the
SFP module, refer to the installation instructions shipped with the
module.
Check that the operating specifications (for instance, wavelength and
maximum operating distance) of the fiber optic port on the remote end
node are compatible with the fiber optic port on the switch.
Check to be sure that the fiber optic ports on the switch and on the end
node are operating at the same speed and duplex mode.
A fiber optic cable contains two separate fiber strands. One strand is
for receiving data and the other is for transmitting data. When you
connect a fiber optic cable to a port, be sure that the receive fiber
connector is connected to the transmit connector on the remote end
node, and that the transmit fiber connector is connected to the receive
connector on the remote node.